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0. D. JENNEY.

ARMATURE FOR DYNAMO ELEOTRIG MACHINES. No. 330,490.

Patented Nov. 17, 1885.

WITNESSES.

PER

N. PETERS, Phmn'Litbugl-aphcr, wahingtm B4 c UNITED STATES PATENT OFFICE.

CHARLES D. JENNEY, OF INDIANAPOLIS, INDIANA.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

1y. SPECIFICATION forming part of Letters Patent No. 330,490, dated November 17, 1885.

Application filed July 20. 1885. Serial No. 172,054.

To all whom it may concern.-

Be it known that 1, CHARLES D. JENNEY, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Armatures, of which the following is a specification.

My said invention relates to the construc tion of the armature of dynamo-electric machines or electric motors, especially to the means whereby the bodies of such armatures are held upon their shafts, as will be hereinafter more particularly described.

Referring to the accompanying drawings, which are made a part hereof, and on which d similar letters of reference'indicate similar parts, Figure l is transverse sectional View, partly on each of the sectional lines 2 z, y y, and 0000 in Fig. 2, of an armature embodying my said invention; Fig. 2, a View of said armature, partly in side elevation and partly in longitudinal section on the dotted line w w in Fig. 1; and Fig 3 a detail sectional view on an enlarged scale, similarlto that. portion of Fig. 1 represented as shown on the sectional line 00 x.

In said drawings, the portions marked A represent the shaft of the armature; B, the spider; O, the body, and D the commutator. Upon the shaft A are rigidly mounted the spiders B and the ends or disks of the com mutator. Said spiders B have, preferably, four arms, as shown, at the outer end of each of which is a lug, I), through which is formed a radial hole, into which the bolt B is to be inserted in constructing the armature. Said bolts B are equal in number to the arms of the spiders, and are inserted, preferably, from the outside through holes drilled through the body of the armature and through the holes in the projections b on the spiders. These bolts and the armature-body are preferably insulated from metallic contact with the spiders by the insulating material I), which is placed, in the manner shown, around the projections on the arms of the spiders, and between them and said bolts and the nuts thereon, in the form of bushings and washers, this being done to break up and destroy the effect of what are known as the Foucault currents, which, as is well known, when per- I mitted, impair the efficiency of the machine as a generator. Around the outer ends or heads of the bolts are also placed pieces of (No model.)

wood I) or other non-conducting or insulating material,and over these are usually placed the bands, which are used to strengthen or bind the body of the armature together. This wood is interposed for the purposes of insuring against accidental electrical connections, which would result upon an abrasion of the wire, and to help hold the wires of the armaturebody in place. Thin wedge-shaped pieces of similar material areinterposed between the several coils of the wire for similar purposes, as shown.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in an armature, of a shaft, spiders mounted thereon having lugs upon the outer ends of their arms,holes in said lugs, the armatnre-body,bolts passing through said body and said holes in said lugs on the arms of said spiders, and insulating material placed around said lugs and between them and said bolts, substantially as set forth.

2. The combination, in an armature, of a shaft, spiders upon said shaft, the armaturebody, bolts passing through said body and engaging with the arms of said spiders, and a non-conducting covering for the heads of said bolts, substantially as set forth.

3. The combination, in an armature, of the shaft, spiders upon said shaft, the body of said armature, bolts passing through said body and connecting with the arms of said spiders, insulating material between said spiders and said bolts, and non-conducting material over the heads of said bolts, substantially as set forth.

4. The combination, in an armature, of a CHARLES D. JENNEY.

In presence of C. BRADFORD, E. W. BRADFORD. 

